<?php function foo1($a=null, $b) { var_dump($a); var_dump($b); } function foo2($a, $b=null, $c) { var_dump($a); var_dump($b); var_dump($c); } foo1(1, 2); foo1(3); foo2(4); foo2(4, 5); foo2(4, 5, 6);
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